Well an 1800 series B is only 80 PTO so a whopping 6 more hp than the series A. That said the hydropower did rob some fuel efficiency but still no way that tractor would drink 12 -13 gallon per hour. Maybe turn the choke off next time.
1800 series A (5.6 gallon per hour by Nebraska test at max load). Again I have spent many hours in the seat of one of these and almost always overloaded.
1800 series B (6.6 gallon per hour under max load at Nebraska test). Admittingly never ran a series B.
I think you are totally getting confused with the different figure 13.18 hp/hrs/gallon which is a totally different measurement ratio that measures efficiency and the higher this number the better. Many Early diesels did not meet this efficiency but later ones did and exceeded it.
A similar in size 85 PTO hp Case 970 diesel for example would be (5.48 gallons per hour at max load) (efficiency 15.64 hp/hrs/gallon).
A similar in size 85 PTO hp Case 970 gasoline (8.02 gallon per hour at max load) (efficiency 10.34 hp/hrs/gallon).
For the record: I am not arguing gasoline is superior to diesel. Diesel is almost always far superior. That said there were some decent gassers that got decent fuel economy and they can be suitable for some applications. I would like to see what a modern gasser with modern technology could achieve fuel economy wise in a gasser tractor.
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